fix https://github.com/umjammer/vavi-nio-file-jnode/security/code-scanning/6

Author: umjammer

fs/src/main/java/org/jnode/partitions/ibm/IBMPartitionTableEntry.java

@@ -176,7 +176,7 @@ public long getNbrBlocks(int sectorSize) {
             blocks /= (1024f / sectorSize);
             odd = getNrSectors() % (1024 / sectorSize);
         } else {
-            blocks *= (sectorSize / 1024f);
+            blocks = (long) (blocks * (sectorSize / 1024f));
         }
         return blocks;
     }